Implant placement systems and one-handed methods for tissue fixation using same

ABSTRACT

Described herein is a simplified placement system and method for a tissue graft anchor by which a surgeon may introduce one or more sutures into a hole in a boney tissue, apply a precise amount of tension to the sutures to advance a soft tissue graft to a desired location, and then advance the anchor into the bone, preferably while maintaining the requisite pre-determined suture tension and without introducing spin to the suture. Particularly preferred embodiments allow for the one-handed operation. To that end, embodiments in which relative axial movement between the inner tensioning device and outer driver device is optionally physically constrained, for example by means of cooperating and/or compressive elements disposed in the respective hub and handle portions, are described herein.

PRIORITY

This application is a continuation-in-part of U.S. patent application Ser. No. 15/012,060 filed Feb. 1, 2016, which, in turn, is a continuation-in-part of U.S. patent application Ser. No. 14/972,662 filed Dec. 17, 2015, which, in turn, is a continuation of U.S. patent application Ser. No. 14/636,389 filed Mar. 3, 2015 (now U.S. Pat. No. 9,226,817 issued Jan. 5, 2016), which, in turn, claims the benefit of U.S. Provisional Application Ser. No. 61/966,744 filed Mar. 3, 2014; 61/998,391 filed Jun. 26, 2014; 61/998,766 filed Jul. 7, 2014; and 61/999,405 filed Jul. 26, 2014, the contents of each of which are hereby incorporated by reference in their entirety. This application also claims the benefit of U.S. Provisional Application Ser. No. 62/284,151 filed Sep. 21, 2015 and 62/392,789 filed Jun. 11, 2016. The contents of the afore-noted priority applications are hereby incorporated by reference in their entirety.

TECHNICAL FIELD OF THE INVENTION

The present invention relates generally to the field of endoscopic and arthroscopic surgery and suture anchor systems and devices for use therein. More particularly, the invention relates to a knotless suture anchor device utilized to secure soft tissue to bone or a boney surface to preclude the need to tie surgical knots to secure the tissue in place with the device. Specifically, the invention relates to a simplified anchor system and method by which the surgeon may introduce one or more sutures into a hole in the bone, apply tension to the sutures to advance the soft tissue to a desired location, and then advance the anchor into the bone while maintaining the suture tension and graft position.

BACKGROUND OF THE INVENTION

The use of implants to affix tissue grafts to bone is well known in the orthopedic arts. Common procedures in which such implants are used include, for example, the repair of rotator cuff tears, the repair of torn ligaments in the knee, among others. In these procedures, a socket is drilled or punched in the bone at the attachment site and a graft is secured to the bone using an implant placed in the socket. The graft may be secured to the implant by sutures, or, alternatively, an end of the graft may be placed in the socket and secured directly by an implant.

In rotator cuff repair, implants commonly referred to as “anchors” are used. These anchors occur in two types: conventional anchors in which the suture is passed through the cuff after anchor placement, and “knotless” anchors in which the suture is passed through the cuff prior to anchor placement. In the former case, the graft is secured in place by tying knots in the suture after it has been passed through the cuff so as to secure the cuff in the desired location. Conversely, as the name implies, when using a knotless anchor, the sutures are passed through the cuff and through a feature of the anchor such that when the anchor is inserted into the socket, the suture position is secured by the anchor. Accordingly, the tying of knots is not required. This is particularly advantageous when performing endoscopic (arthroscopic) repairs since the tying of knots arthroscopically through a small diameter cannula can be difficult for some surgeons and, moreover, there is an opportunity for tangling of the sutures.

Many anchors, both conventional and knotless, are supplied to the surgeon mounted on a driver—a device that the surgeon uses to place the anchor in the prepared socket in the bone. In the case of threaded anchors, the driver has a form like that of a screwdriver, and indeed functions in the same manner. The proximal portion of the device forms a handle that is grasped by the surgeon. Distal to the handle, an elongate distal portion has formed at its distal end features for transmitting torque to an implant. Some anchors, generally metallic anchors such as, for instance, the Revo® Suture Anchor by Conmed Corporation (Utica, N.Y.) and Ti-Screw Suture Anchor by Biomet Corporation (Warsaw, Ind.), have a protruding (male) proximal portion with a cross-section suitable for transmitting torque (typically hexagonal or square) and a transverse eyelet formed therein. The driver for such devices has a complimentary socket (female) formed in its distal end and a cannulation that extends from the interior of the socket to the proximal handle portion of the device. Sutures loaded into the eyelet of the anchor extend through the driver cannulation (or “lumen”) and are removably secured to the handle so as to retain the anchor in the socket of the driver. Such anchors are referred to in the orthopedic arts as “pre-loaded”, meaning that sutures come loaded into an anchor that is ready for placement by the surgeon using the associated driver.

Other threaded anchors have a socket (female) formed in their proximal ends. Once again, the socket has a cross-section suitable for transmitting torque that is typically polygonal, usually square or hexagonal. Typical of these are the V-LoX™ family of titanium suture anchors by Parcus Medical (Sarasota, Fla.) and the ALLthread™ anchors by Biomet Corporation (Warsaw, Ind.). The drivers for such devices have a protruding (male) torque-transmitting feature complementary to the socket (female) formed in the proximal end of the anchor. These drivers may be cannulated to accommodate sutures that are preloaded into the anchor in the manner previously described, with the sutures being either for the purpose of securing tissue after anchor placement, or for the purpose of removably securing the anchor to the driver, wherein the sutures are released from the driver after the anchor is placed in the bone and subsequently removed and discarded so as to allow removal of the driver from the anchor. The depth of the socket in the proximal end of the implant must be sufficient to enable transmission of the requisite torque needed for anchor placement without deforming or fracturing the implant. As the maximum depth of the torque-transmitting portion is generally limited only by the configuration of the anchor, it is considered to be matter of design choice. Indeed, the implant may have a cannulation that extends axially through the implant as well as a torque-transmitting cross-section forming a substantial proximal portion or the entirety of the implant's length. Implants of the Bio-Tenodesis Screw™ System by Arthrex, Inc have a cannulation with a constant torque-transmitting cross-section, and are used with a driver having a torque-transmitting portion that extends beyond the distal end of the anchor, wherein the portion of the driver extending beyond the anchor and a suture loop in the driver cannulation are used together to insert the end of a graft into a prepared socket prior to placement of the implant.

Knotless suture anchor fixation is a common way of repairing soft tissue that has been torn from bone. Illustrative examples of such “knotless” anchors include the Allthread™ Knotless Anchors by Biomet Incorporated (Warsaw, Ind.), the SwiveLock® Knotless Anchor system by Arthrex, Incorporated (Naples, Fla.), the HEALIX Knotless™ Anchors by Depuy/Mitek, Incorporated (Raynham, Mass.) and the Knotless Push-In Anchors such as the Knotless PEEK CF Anchor by Parcus Medical (Sarasota, Fla.). The procedure requires drilling or punching of holes into a properly prepared boney surface. After suture has been passed through soft tissue, the suture anchor is introduced into the socket and driven into the socket using a mallet or by screwing the anchor into the socket using a driver device. These driver devices typically resemble a screwdriver in form, having a proximal handle portion for applying torque or percussive force, and an elongate rigid distal portion having at its distal end a torque or percussive force-transmitting configuration. In the case of torque-transmitting drivers used with threaded anchors, the distal end of the driver typically has an elongate hexagonal or square distally extending portion that, through coupling with a lumen in the anchor having a complementary cross-section, transmits torque to the anchor. The lumen may extend through anchor so that the distal portion of the driver protrudes from the distal end of the anchor and rotates with the anchor during anchor placement.

Because the suture is drawn into the prepared socket along with the anchor during anchor placement, it is essential that a suitable length of suture extends between the graft and the anchor so that when the anchor is suitably positioned within the socket, the graft is properly positioned. Determining the proper length of suture to allow between the anchor and the graft so as to achieve optimal graft positioning is complicated since suture(s) may twist (a process referred to in the orthopedic arts as “suture spin”) during anchor placement, thereby shortening the effective length and changing the final graft position and/or undesirably increasing the suture tension.

U.S. Pat. No. 6,544,281 to ElAttrache et al. describes a cannulated anchor placement system having a rotating inner member (which acts as the driver) and a stationary outer member, wherein the rotating inner member serves to drive the threaded anchor. The rotating “driver” extends past the distal end of the anchor and is inserted into a prepared socket in the boney surface. A suture loop formed distal to the distal end of the driver “captures” or “secures” sutures attached to a graft or the graft itself to the distal end of the driver. The distal end of the driver is then inserted into the socket to a proper depth for anchor placement thereby drawing the graft to the desired position prior to placement of the anchor. The anchor is then threaded into the socket to the predetermined depth. This system constitutes an improvement over other commercially available alternatives. However, because the graft or sutures are secured to or pass through the distal end of the rotating inner (or “driver”), torque is transmitted not only to the anchor but also to the graft or sutures attached thereto by the suture loop. Accordingly, twisting of the sutures or graft frequently occurs, thereby changing the resulting suture tension and/or the graft position (a process referred to in the orthopedic arts as “graft shift”).

U.S. Pat. No. 8,663,279 by Burkhart et al. describes a knotless anchor system similar in construction to that of ElAttrache et al. A “swivel” implant having formed therein an eyelet is releasably and pivotably mounted to the distal end of a driver distal portion that extends distally beyond the distal end of an anchor. After sutures are passed through the graft, they are threaded into the eyelet of the swivel implant at the distal end of the driver. The distal end of the driver with the swivel implant is then inserted into the socket. By pulling on the suture tails, the graft is moved into position and secured by screwing the anchor into the socket. However, because the sutures/graft are secured to the driver by means of the swivel eyelet implant, the torque that may be transmitted to the sutures/graft is limited. However, torque transmission is not eliminated since the swivel implant is retained in the driver distal end by a suture loop under tension, which extends through the cannula of the driver to the driver's proximal end where the suture ends are cleated. While an improvement over the ElAttrache anchor system, suture spin is not eliminated in all cases, and indeed, cannot be since the suture-retaining implant is mounted to the driver, which rotates during anchor placement. As such, some level of torque transmission due to friction between the driver distal end and the swivel eyelet implant is inevitable.

Other knotless anchors such as the ReelX STT™ Knotless Anchor System by Stryker® Corporation (Kalamazoo, Mich.) and PopLok® Knotless Anchors by ConMed Corporation (Utica, N.Y.) have complex constructions and require that the surgeon perform a sequence of steps to achieve a successful anchor placement with the desired suture tension and proper cuff position. The sequence of steps adds to procedure time and creates opportunities for failure of the placement procedure if a step is not performed properly.

Accordingly, there is a need in the orthopedic arts for a knotless anchor system that allows the surgeon to establish the graft position, and, while maintaining that position, place the anchor without changing the suture tension or causing a shift in the graft position due to suture spin. Furthermore, if the anchor is threaded, placement of the anchor in the socket must occur without spinning of the suture.

If a graft such as a biceps tendon is directly affixed to a bone by insertion of the graft into a socket (a technique referred to in the art as “bio-tenodesis”), it is essential that the graft be fully inserted so as to be engaged by the full length of the implant. It is also important that the position of the graft be maintained during anchor insertion. Further, it is essential that the alignment of the implant (referred to in this case as an “interference screw”) be coaxial, or if slightly shifted, parallel to the axis of the socket. It is also desirable that the sutures used to draw the graft into the socket do not spin or twist during anchor placement as this may change the position and tension of the graft from that intended by the surgeon. In sum, there is a also need in the suture arts for an interference screw and implant placement system in which graft position within the socket is maintained throughout the implant placement process, and in which suture spin or twisting is prevented.

Improved implant systems can also find utility in the context of spinal fusion surgery, wherein rigid posterior or lateral or anterior elements, either pedicle based, interbody based, or vertebral body based, or posterior element based, are routinely performed, by the placement of screws into the bony spinal elements and, through either internal mechanisms or rigid bridging devices, engage into adjacent bony elements or interspaced to provide rigid fixation. Illustrative examples of commercially available spinal fixation devices include, for example, Synthes (Raynham, Mass.), Nuvasive (San Diego, Calif.) and Amendia (Atlanta, Ga.), devices that interlock cervical, thoracic or lumbar or sacral levels to rigidly prevent movement and fuse or allow for fusion of diseased or degenerated segments of spine to prevent painful or disabling movement. These rigid zones of fixation create zones above and below these constructs, which are known as junctional or transitional zones or levels. There is need in the art for a bracing mechanism that can disperse load from the rigidly fixed spinal segments having undergone prior fusion or fixation, to unfused adjacent spinal segments. Such a bracing device, while not providing absolute rigid fixation but allowing for movement, would provide for bracing of the non fused segments while off-loading or reducing the forces that, prior to the application of such a device, would have been entirely borne by the intervertebral discs and adjacent bony elements and ligaments adjacent to the prior rigid fixed segments. It is this increased force that is postulated to result in failure of the adjacent segment.

Suitable bracing devices can be inserted either along the anterior aspect of the spinal segments, the posterior aspect of the spinal segments, or between spinal segments. Between these anchor devices and the spinal segments or between the fusion devices and spinal segments, or bridging these spinal segments and fusion devices to intact spinal segments, either soft tissue in the form of grafts, or with braided suture constructs, or with a combination thereof, bone anchors are utilized to insert these tension bearing or tension off loading constructs. Such tension-bearing constructs serve to provide a dynamic rather that rigid transition from the fused spinal segments to the adjacent spinal segments. The purposes of theses constructs are to reduce the load applied to the intervertebral discs above and below the fused spinal segments. This transitional loading allows the adjacent musculature to recover following spinal fusion surgery while protecting the discs until the muscle has recovered sufficiently, while also allowing needed movement at the transitional levels so as to not have created another static or rigidly fixed level. In addition, such constructs can be utilized to reconstruct spinal ligaments. Such reconstructions can be performed either independent of, or in addition to rigid spinal fixation or along with intervertebral body disc replacements to help restore normal spinal segment mobility and preserve or protect the constructs.

SUMMARY OF THE INVENTION

A primary objective of the present invention is to provide improved means and methods of attaching soft tissues (i.e., “grafts”) to bone in situ. The embodiments of the instant invention are described hereinbelow as a system and method for producing a matrix of implants for the anchoring of a graft to bone. Any graft fixation system which uses an implant placement system with an optionally cannulated non-rotating tensioning device (i.e., the relatively fixed “inner assembly”) positioned within a cannulation or “lumen” of a cannulated driver (i.e., the relatively movable “outer assembly”) to tension sutures in a prepared socket for the placement of a simple one-piece cannulated anchor are contemplated by the present invention. Illustrative aspects and embodiments of the present invention in accordance with the foregoing objective are as follows:

In a first aspect, the present invention provides prosthetic implants and systems for their placement in a target boney surface for the knotless securing of a soft tissue graft thereto. The instant invention contemplates a novel placement system including a non-rotating cannulated tensioning device (“inner assembly”) positioned within a rotationally and axially movable cannulated driver (“outer assembly”). In a preferred embodiment, a tubular distal element of the tensioning device extends distally beyond the distal end of the cannulated driver. A cannulated threaded implant (or “anchor”) is removably mounted to the torque-transmitting distal portion of the driver. Sutures placed in the graft are drawn into the distal end of the elongate distal portion of the cannulated tensioning device, which extends beyond the distal end of the implant. If a threaded implant is used, the distal end of the cannulated driver preferably includes torque-transmitting features that, together with complementary features formed in the proximal portion of the implant or anchor, allow the transmission of torque thereto. If an interference plug-type anchor is used, the distal end of the driver is preferably configured to transmit axial force to the anchor, the proximal end of which has a suitably complementary configuration to enable secure attachment.

In operation, sutures placed in the graft are drawn into the distal end of the tensioning device. The elongate distal portion of tensioning device is inserted into a properly prepared socket in the target boney surface so that the distal end of the tensioning device, with its sutures is positioned at the bottom of the socket. Tension is then applied to the sutures by pulling on their proximal ends, which extend beyond the proximal portion of the tensioning device to move the graft into the desired position, namely into the prepared socket adjacent to the distal element of the tensioning device. The desired tension may be maintained by cleating proximal portions of the suture(s) into slots optionally formed in the handle of the tensioning device. The anchor (or interference screw) may then be screwed, threaded or otherwise driven into the socket, thereby trapping the sutures or graft between the anchor exterior surface and the socket wall. Critically, twisting of the suture(s) or graft(s) is prevented by the non-rotating distal tubular portion of the tensioning device that remains distal to the anchor distal end during anchor placement. In addition, tension on the sutures and the position of the graft are maintained during placement of the anchor throughout the procedure. After anchor placement, the driver and tensioning device are withdrawn, removed from the site, at which point the sutures may be trimmed to complete the procedure.

In contrast to the Burkhart and ElAttrache anchor systems, suture tensioning and establishment of the graft position are not accomplished using the driver's distal end or using an implant positioned in the driver's distal end. Rather, suture tension and graft position are established and maintained by the distal portion of a non-rotating tensioning device that extends beyond the driver and anchor distal ends. Because of this, the transmission of torque to the sutures and/or graft by the driver present in the Burkhart and ElAttrache systems is eliminated, along with its associated suture or graft spin.

The system and method of the instant invention provide a simplification over other currently available anchoring methods and hardware in that fewer steps are required and moreover the anchor has a simple, single-piece construction. The anchor system is scalable and, due to its simple construction, may be used with anchors smaller than those permitted using other currently available systems. The composition and construction in the anchor may be readily modified simply by changing the material from which it is constructed, by increasing or reducing the diameter or length of the anchor, by increasing or decreasing the wall thickness of the anchor, by modifying the profile of the exterior, or by any combination of these means. All such modifications are contemplated as within the scope of the present invention.

In another aspect, the present invention provides a method for affixing a soft tissue graft to a target boney surface, the method including the steps of:

-   -   a. providing a placement system having a cannulated non-rotating         tensioning device (“inner assembly”) and a cannulated driver         device (“outer assembly”), wherein the tensioning device is         positioned within the cannulation or “lumen” of the driver         device,     -   b. positioning a cannulated anchor onto the distal         torque-transmitting portion of the driver, over a distally         extending element of the tensioning device,     -   c. producing a suitably configured hole (i.e., “socket”) in a         prepared boney surface at a desired target location using a         drill, tap, punch or equivalent hole-producing device,     -   d. drawing sutures from the graft into the lumen of the         tensioning device,     -   e. inserting the distal end of the tensioning device into the         socket,     -   f. applying tension to the sutures to draw the graft to a         desired position,     -   g. placing the anchor (or interference screw) in the socket,     -   h. withdrawing the placement system,     -   i. trimming the suture tails, and     -   j. optionally repeating steps (c) through (i) as required.

In an alternate embodiment of the present invention, identical in all aspects to the previous embodiment except as subsequently described, the tubular distal portion of the tensioning device is replaced by a rod having formed at its distal end a sharpened fork portion. Two (or more) parallel, axially extending tines form the fork, the tines being spaced apart so that sutures may slide freely through the channel(s) formed between the tines. An anchor placement system commensurate with such an embodiment is used in the following manner: First, a cannulated threaded implant is removably mounted to the torque-transmitting distal portion of the driver. Sutures placed in the graft are then positioned in the channel(s) of the distal fork portion of the tensioning device. The elongate distal portion of the tensioning device with the sutures positioned within its distal channel is then inserted into a prepared socket so that the distal end of the tensioning device with its sutures is positioned at the bottom of the socket. Tension is then applied to the sutures by pulling on their proximal ends to draw the graft into the desired position. The desired tension and graft position may be maintained by cleating the suture proximal portions in slots optionally formed in the handle of the tensioning device. The anchor is then screwed, threaded or otherwise axially driven into the socket by the driver, thereby trapping the sutures or graft between the anchor exterior surface and the socket wall. Twisting of the sutures or graft is prevented by the non-rotating distal fork portion of the tensioning device that remains distal to the anchor distal end during anchor placement. The tension on the sutures and the position of the graft are maintained during placement of the anchor. After anchor placement, the driver and tensioning device are removed from the site and the sutures trimmed to complete the procedure.

In certain embodiments particularly applicable to small diameter implants, the tensioning device may be cannulated and coupled with an elongate element formed from a suitable shape memory metal and/or superelastic polymeric material that, in a first configuration, is provided with a suture retention loop at its distal end. The distal end of the elongate element extends out of and distally away from the distal end of the cannulated tensioning device so as to be accessible to free suture ends. In operation, one or more sutures are loaded into the distal retention loop. The sutures are then tensioned and secured as previously described, through cooperation of the cannulated tensioning device, cannulated anchoring implant and torque-transmitting driver device. After the implant is properly placed, the elongate element may be readily transformed into a second relatively linear configuration and axially withdrawn from the tensioning lumen. As noted elsewhere, the elongate element may preferably take the form of a nitinol wire.

An anchor placement system of the present embodiment may also include a mechanism for releasably preventing relative axial and rotational movement between the driver and the tensioning device, such means optionally positioned within the cannulation (or “lumen”) of the driver. In a first condition, used during tensioning of the suture, relative axial and rotational motion is of the driver relative to the tensioning device is prevented. In a second condition, used during placement of the anchor, the driver may be advanced axially on the tensioning device to bring the anchor to the socket, and rotated to screw the anchor into the socket, with the tensioning device remaining stationery so as to maintain suture tension and prevent twisting of the sutures.

In a particularly preferred embodiment, prevention of relative motion is provided by a removable key having one or more protrusions, coupled with features formed on the handles of the tensioning device and driver such that, when the features are in alignment, engagement by the one or more protrusions of the key prevents relative axial or rotational movement between the torque-transmitting driver and the tensioning device. Removal of the key allows the driver to be advanced distally and rotated relative to the tensioning device. Other embodiments are anticipated in which other means are used to releasably prevent relative motion.

Certain preferred embodiments of the present invention are configured for one-handed operation by the surgeon. In these embodiments, a suitable tensioning device is irremovably (i.e., permanently) affixed to and/or positioned within an associated driver device, the driver device is axially movable between a first proximal position and a second distal position relative to the tensioning device. In the first proximal position, the distal portion of the tensioning device extends distally beyond the implant so as to allow tensioning of sutures and positioning of a graft as described previously herein as well as in related co-pending applications incorporated herein by reference. Advancing the driver distally toward its second, distal position brings the implant to the prepared socket in preparation for placement. Thereafter, the implant is threaded or axially driven into the socket. Distal motion by the driver relative to the tensioning device is resisted by a spring within the driver handle. The spring tension is sufficient to ensure that the distal end of the tensioning device remains in contact with the bottom of the socket to maintain graft position and to prevent rotation of the tensioning device during anchor placement.

In yet another aspect, like the previous in all other respects except as subsequently described, the suture attached to the graft is positioned within the distal fork and tensioned such that the proximal end of the graft is adjacent to the fork, the tension being maintained by cleating of the sutures on the tensioning device handle. The distal portion of the tensioning device with the graft is inserted into the prepared socket. The anchor is then threaded or driven into the socket as previously described, thereby trapping the graft proximal portion between the anchor exterior surface and a first portion of the socket wall, and the attached sutures between the anchor exterior surface and a second, laterally opposed portion of the socket wall.

In a variation of the previous aspect, the graft may be pierced by the sharpened distally extending members of the distal fork. The distal portion of the tensioning element with the graft is inserted into the prepared socket. Once again, the anchor is then threaded or driven into the socket, thereby trapping the graft proximal portion between the anchor exterior surface and a portion of the socket wall.

In another variation of the previous aspect, the graft is pierced by the sharpened distally extending members of the distal fork a predetermined distance from the graft distal end such that when the distal portion of the tensioning element with the graft is inserted into the prepared socket, the proximal end of the graft protrudes above the opening of the socket. The anchor is then threaded or driven into the socket, thereby trapping the graft proximal portion between the anchor exterior surface and first and second laterally opposed portions of the socket wall.

In still yet another aspect, identical in form to the devices and insertion systems previously herein described, the tensioning device has a proximal handle portion that is an assembly of first and second rigid elements with an elastic element positioned therebetween. Applying a distal force to a first rigid element of the handle of the tensioning device causes deflection of the elastic element proportional to the tension in the graft attached to the distal fork. This allows the practitioner to measure the tension in the graft. By establishing the tension in the graft to a predetermined value prior to placement of the anchor, the tension may then be maintained at the predetermined value during anchor placement.

These and other aspects are accomplished in the invention herein described, directed to a system and method for producing a matrix of implants for the anchoring of a graft to bone. Further objects and features of the invention will become more fully apparent when the following detailed description is read in conjunction with the accompanying figures and examples. For example, any graft fixation system that uses a non-rotating inner member (tensioning device) and a movable outer member (driver) to tension sutures in a prepared socket for the placement of a simple one-piece cannulated anchor falls within the scope of this invention. However, it is to be understood that both the foregoing summary of the invention and the following detailed description are of a preferred embodiment, and not restrictive of the invention or other alternate embodiments of the invention. In particular, while the invention is described herein with reference to a number of specific embodiments, it will be appreciated that the description is illustrative of the invention and is not constructed as limiting of the invention.

BRIEF DESCRIPTION OF THE FIGURES

Various aspects and applications of the present invention will become apparent to the skilled artisan upon consideration of the brief description of figures and the detailed description of the present invention and its preferred embodiments that follows:

FIG. 1A is a plan view of the cannulated driver and anchor of an implant placement system of the present invention.

FIG. 1B is an expanded view of the distal portion of the objects of FIG. 1A at location C.

FIG. 1C is a side elevational sectional view of the objects of FIG. 1A at location A-A of FIG. 1A.

FIG. 2A is a perspective view of the objects of FIG. 1A.

FIG. 2B is an expanded view of the distal portion of the objects of FIG. 2A at location B.

FIG. 3 is a plan view of the tensioning device of an implant placement system of the present invention.

FIG. 4 is an expanded sectional view of the tensioning device of FIG. 3 at location A-A.

FIG. 5 is an expanded view of the proximal hub portion of the tensioning device of FIG. 3 at location A.

FIG. 6 is a side elevational view of the objects of FIG. 3.

FIG. 7 is an expanded view of the objects of FIG. 6 at location B.

FIG. 8 is a perspective view of the tensioning device of FIG. 3.

FIG. 9 is an expanded view of the objects of FIG. 8 at location C.

FIG. 10 is a side elevational view of a key for an implant placement system of the present invention.

FIG. 11 is a perspective view of the objects of FIG. 10.

FIG. 12 is an exploded view of the assembly of a first embodiment of an implant placement system of the present invention.

FIG. 13 is a plan view of a fully assembled first embodiment of an implant placement system of the instant invention.

FIG. 14 is an expanded view of the distal portion of FIG. 13 at location A.

FIG. 15 is an expanded side elevational sectional view of the objects of FIG. 13 at location A-A.

FIG. 16 is a side elevational view of the objects of FIG. 13.

FIG. 17 is an expanded view of the objects of FIG. 13 at location B.

FIG. 18 is a perspective view of the objects of FIG. 13.

FIG. 19 is an expanded view of the objects of FIG. 13 at location C.

FIG. 20 is a perspective view of a first embodiment implant placement system with sutures being loaded into the system.

FIG. 21 is a perspective view of the first embodiment implant placement system with the sutures loaded.

FIG. 22 schematically depicts a socket placed in a bone prior to the placement of an implant.

FIG. 23 depicts the first embodiment implant placement system positioned for the first step of implant placement.

FIG. 24 depicts the proximal portion of the first embodiment implant placement system during the first step of implant placement.

FIG. 25 depicts the distal portion of the first embodiment implant placement system during the first step of implant placement.

FIG. 26 depicts the first embodiment implant placement system positioned for the second step of implant placement.

FIG. 27 depicts the proximal portion of the embodiment implant placement system during the second step of implant placement.

FIG. 28 depicts the distal portion of the first embodiment implant placement system during the second step of implant placement.

FIG. 29 depicts the first embodiment implant placement system positioned for the third step of implant placement.

FIG. 30 depicts the proximal portion of the first embodiment implant placement system during the second step of implant placement.

FIG. 31 depicts the distal portion of the first embodiment implant placement system during the third step of implant placement.

FIG. 32 depicts the site at the completion of implant placement using an implant placement system of the instant invention.

FIG. 33 is a plan view of a second embodiment of an implant placement system of the instant invention wherein the tubular distal portion of the tensioning device is replaced by a rod having formed at its distal end a sharpened fork portion.

FIG. 34 is a side elevational view of the objects of FIG. 33.

FIG. 35 is an expanded proximal end view of the objects of FIG. 33.

FIG. 36 is an expanded plan view of the distal portion of the elements of FIG. 33.

FIG. 37 is a side elevational view of the objects of FIG. 36.

FIG. 38 is a sectional view of the objects of FIG. 36 at location B-B.

FIG. 39 is a distal perspective view of the objects of FIG. 33.

FIG. 40 is an expanded view of the objects of FIG. 39 at location A.

FIG. 41 is a proximal perspective view of the objects of FIG. 33.

FIG. 42 is an expanded view of the objects of FIG. 41 at location B.

FIG. 43 depicts an alternate embodiment implant system of the present invention in use positioning sutures in a socket for the securing of a graft using an anchor.

FIG. 44 is an expanded view of the distal portion of the objects of FIG. 43 depicting the placement site.

FIG. 45 depicts the alternate “fork” embodiment system with the sutures tensioned so as to position the graft.

FIG. 46 is an expanded view of the distal portion of the objects of FIG. 45 depicting the placement site.

FIG. 47 is an expanded view of the site depicting the system with the anchor placed.

FIG. 48 is an expanded view of the site at completion of the anchor placement and removal of the system with the sutures trimmed.

FIG. 49 depicts a first step of an alternate repair method for securing a graft in a socket using an implant as contemplated by the present invention.

FIG. 50 depicts a second step of the alternate repair method

FIG. 51 depicts a third step of the alternate repair method.

FIG. 52 depicts the site of the graft attachment at the completion of the repair using the alternate repair method.

FIG. 53 depicts a first step of a second alternate repair method for securing a graft in a socket using an implant.

FIG. 54 depicts a second step of the alternate repair method

FIG. 55 depicts a third step of the alternate repair method.

FIG. 56 depicts a fourth step of the alternate repair method.

FIG. 57 depicts the site of the graft attachment at the completion of the repair using the alternate embodiment repair method.

FIG. 58 depicts a first step of a third alternate repair method for securing a graft in a socket using an implant.

FIG. 59 depicts a second step of the alternate repair method

FIG. 60 depicts a third step of the alternate repair method.

FIG. 61 depicts a fourth step of the alternate repair method.

FIG. 62 depicts a fifth step of the alternate repair method.

FIG. 63 depicts the site of the graft attachment at the completion of the repair using the alternate embodiment repair method.

FIG. 64 is a plan view of a distal assembly for the tensioning device for an alternate embodiment anchor placement system that includes a force indicating inner tensioning assembly.

FIG. 65 is a side elevational view of the objects of FIG. 64.

FIG. 66 is a sectional view of the objects of FIG. 64 at location A-A.

FIG. 67 is an expanded proximal axial view of the objects of FIG. 64.

FIG. 68 is a perspective view of the objects of FIG. 64.

FIG. 69 is a expanded view of the proximal portion of the objects of FIG. 68 at location A.

FIG. 70 is a plan view of the handle portion of a tensioning device for an alternate embodiment anchor placement system.

FIG. 71 is a side elevational view of the objects of FIG. 70.

FIG. 72 is a sectional view of the objects of FIG. 70 at location A-A.

FIG. 73 is a perspective view of the objects of FIG. 70.

FIG. 74 is an expanded proximal axial view of the objects of FIG. 70.

FIG. 75 is a perspective view of an end cap for the tensioning device for an alternate embodiment anchor placement system.

FIG. 76 is a plan view of the objects of FIG. 75.

FIG. 77 is a distal axial view of the objects of FIG. 75.

FIG. 78 is a side elevational view of the objects of FIG. 75.

FIG. 79 is a sectional view of the objects of FIG. 76 at location A-A.

FIG. 80 is a plan view of an alternate embodiment anchor placement system of the present invention that allows the surgeon to measure the tension in the graft during the attachment of the graft in accordance with the methods of the present invention.

FIG. 81 is an expanded view of the proximal portion of the objects of FIG. 80 at location A.

FIG. 82 is a perspective view of the objects of FIG. 80.

FIG. 83 is an expanded view of the proximal portion of the objects of FIG. 82 at location A.

FIG. 84 is an central expanded side elevational sectional view of the objects of FIG. 81.

FIG. 85 is a perspective view of the outer driver assembly for an alternate embodiment implant placement system of the present invention.

FIG. 86 is a plan view of the driver of FIG. 85.

FIG. 87 is a side elevational view of the driver of FIG. 85.

FIG. 88 is a sectional view of the objects of FIG. 86 at location A-A.

FIG. 89 is a perspective view of the inner tensioning assembly for an alternate embodiment implant placement system of the present invention.

FIG. 90 is a plan view of the objects of FIG. 89.

FIG. 91A is an expanded sectional view of the objects of FIG. 89 at location A-A.

FIG. 91B is an expanded view of the objects of FIG. 91A at location A.

FIG. 92 is a perspective view of a control element for an alternate embodiment implant placement system of the present invention.

FIG. 93 is a side elevational view of the control element of FIG. 92.

FIG. 94 is a perspective view of an exploded assembly of an alternate embodiment implant placement system comprising the outer driver assembly of FIG. 85, the inner tensioning assembly of FIG. 89 and the control element of FIG. 92.

FIG. 95 is a perspective view of an alternate embodiment implant placement system formed of the assembled elements of FIG. 94 with the distal portion of the inner tensioning assembly protruding beyond the implant in preparation for implant placement.

FIG. 96 is a plan view of the objects of FIG. 95.

FIG. 97 is a side elevational view of the elements of FIG. 95.

FIG. 98A is an expanded sectional view of the objects of FIG. 96 at location A-A.

FIG. 98B is an expanded view of the objects of FIG. 98A at location A.

FIG. 98C is an expanded view of the objects of FIG. 98B at location C.

FIG. 99 is an expanded sectional view of the objects of FIG. 96 at location D-D.

FIG. 100 is a perspective view of the anchor placement system of FIG. 95 with the outer driver assembly and implant advanced distally as when the implant is fully placed in a socket.

FIG. 101 is a plan view of the objects of FIG. 100.

FIG. 102 is a side elevational view of the objects of FIG. 100.

FIG. 103 is an expanded sectional view of the objects of FIG. 101 at location A-A.

FIG. 104 is an expanded sectional view of the objects of FIG. 101 at location D-D.

FIG. 105 is a perspective view of the exploded assembly of an alternate anchor placement system of the present invention.

FIG. 106A is a perspective view of an alternate embodiment anchor placement system formed of the elements and assemblies of FIG. 105 with the distal portion of the inner tensioning assembly extended beyond the implant in preparation for anchor placement.

FIG. 106B is an expanded view of the objects of FIG. 106A at location A.

FIG. 107 is a plan view of the anchor placement system of FIG. 106.

FIG. 108 is a side elevational view of the objects of FIG. 106.

FIG. 109 is an expanded sectional view of the objects of FIG. 107 at location B-B.

FIG. 110 is an expanded sectional view of the objects of FIG. 107 at location A-A.

FIG. 111 is a perspective view of the anchor placement system of FIG. 106 with the outer driver assembly and implant advanced on the inner tensioning assembly as when an implant is fully placed in a socket.

FIG. 112 is a plan view of the objects of FIG. 111.

FIG. 113 is a side elevational view of the objects of FIG. 111.

FIG. 114 is an expanded sectional view of the objects of FIG. 112 at location B-B.

FIG. 115 is an expanded sectional view of the objects of FIG. 112 at location A-A.

FIG. 116 is a perspective view of the exploded assembly of an alternate embodiment implant placement system of the present invention.

FIG. 117 is a perspective view of an alternate embodiment implant placement system of the present invention formed from the elements and assemblies of FIG. 116 with the distal portion of the inner tensioning assembly protruding beyond the implant in preparation for implant placement.

FIG. 118 is a plan view of the objects of FIG. 117.

FIG. 119 is a side elevational view of the objects of FIG. 117.

FIG. 120 is an expanded sectional view of the objects of FIG. 118 at location B-B.

FIG. 121 is an expanded sectional view of the objects of FIG. 118 at location A-A.

FIG. 122 is a perspective view of the anchor placement system of FIG. 117 with the outer driver assembly and implant advanced on the inner tensioning assembly as when an implant is fully place in a socket.

FIG. 123 is a plan view of the objects of FIG. 122.

FIG. 124 is a side elevational view of the objects of FIG. 122.

FIG. 125 is an expanded sectional view of the objects of FIG. 123 at location A-A.

FIG. 126 is an expanded sectional view of the objects of FIG. 123 at location B-B.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Aspects of the present invention relate to and/or overlap with aspects described in related co-pending and contemporaneously filed applications entitled “Ceramic Implant Placement Systems And Superelastic Suture Retention Loops For Use Therewith” [Attorney Docket No. TEN-004CIP2] and “Multiple Implant Constructions And Fixation Methods Associated Therewith” [Attorney Docket No. TEN-004CIP4], the entire contents of which are hereby incorporated in their entirety.

Although any methods and materials similar or equivalent to those described herein can be used in the practice or testing of embodiments of the present invention, the preferred methods, devices, and materials are now described. However, before the present materials and methods are described, it is to be understood that the present invention is not limited to the particular sizes, shapes, dimensions, materials, methodologies, protocols, etc. described herein, as these may vary in accordance with routine experimentation and optimization. It is also to be understood that the terminology used in the description is for the purpose of describing the particular versions or embodiments only, and is not intended to limit the scope of the present invention which will be limited only by the appended claims. Accordingly, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. However, in case of conflict, the present specification, including definitions below, will control.

In the context of the present invention, the following definitions apply:

The words “a”, “an” and “the” as used herein mean “at least one” unless otherwise specifically indicated. Thus, for example, reference to an “opening” is a reference to one or more openings and equivalents thereof known to those skilled in the art, and so forth.

The term “proximal” as used herein refers to that end or portion which is situated closest to the user of the device, farthest away from the target surgical site. In the context of the present invention, the proximal end of the implant system of the present invention includes the driver and handle portions.

The term “distal” as used herein refers to that end or portion situated farthest away from the user of the device, closest to the target surgical site. In the context of the present invention, the distal end of the implant systems of the present invention includes components adapted to fit within the pre-formed implant-receiving socket.

In the context of the present invention, the terms “cannula” and “cannulated” are used to generically refer to the family of rigid or flexible, typically elongate lumened surgical instruments that facilitate access across tissue to an internally located surgery site.

The terms “tube” and “tubular” are interchangeably used herein to refer to a generally round, long, hollow component having at least one central opening often referred to as a “lumen”.

The terms “lengthwise” and “axial” as used interchangeably herein to refer to the direction relating to or parallel with the longitudinal axis of a device. The term “transverse” as used herein refers to the direction lying or extending across or perpendicular to the longitudinal axis of a device.

The term “lateral” pertains to the side and, as used herein, refers to motion, movement, or materials that are situated at, proceeding from, or directed to a side of a device.

The term “medial” pertains to the middle, and as used herein, refers to motion, movement or materials that are situated in the middle, in particular situated near the median plane or the midline of the device or subset component thereof.

As discussed above, when a tissue, more particularly a soft connective tissue in a joint space, becomes damaged or torn from its associated bone or cartilage, surgery is usually required to reattach the tissue or reconstruct the bone. The present invention is directed to various means and mechanisms for securing the displaced tissue to boney tissue.

As used herein, the term “tissue” refers to biological tissues, generally defined as a collection of interconnected cells that perform a similar function within an organism. Four basic types of tissue are found in the bodies of all animals, including the human body and lower multicellular organisms such as insects, including epithelium, connective tissue, muscle tissue, and nervous tissue. These tissues make up all the organs, structures and other body contents. While the present invention is not restricted to any particular soft tissue, aspects of the present invention find particular utility in the repair of connective tissues such as ligaments or tendons, particularly those of the shoulder, elbow, knee or ankle joint.

In a similar fashion, while the present invention is not restricted to any particular boney tissue, a term used herein to refer to both bones and cartilage, aspects of the present invention find particular utility in the repair or reattachment of connective tissues to the boney elements of the shoulder, elbow, knee or ankle joint.

When the damaged tissue is of sufficient quantity and quality, the damaged portion may simply be directly reattached to the bone from which it was torn so that healing back to the bone can take place. However, in other situations, a “graft” may be needed to stimulate regrowth and permanent attachment. In the context of the present invention, the term “graft” refers to any biological or artificial tissue being attached to the boney tissue of interest, including:

-   -   Autografts, i.e., grafts taken from one part of the body of an         individual and transplanted onto another site in the same         individual, e.g., ligament graft;     -   Isografts, i.e., grafts taken from one individual and placed on         another individual of the same genetic constitution, e.g.,         grafts between identical twins;     -   Allografts, i.e., grafts taken from one individual placed on         genetically non-identical member of the same species; and     -   Xenografts, i.e., grafts taken from one individual placed on an         individual belonging to another species, e.g., animal to man.

Autografts and isografts are usually not considered as foreign and, therefore, do not elicit rejection. Allografts and xenografts are recognized as foreign by the recipient thus carry a high risk of rejection. For this reason, autographs and isografts are most preferred in the context of the present invention.

Surgical interventions such as contemplated herein generally require the boney tissue to be prepared for receiving the graft. In the context of the present invention, such preparation includes the formation of a “socket”, i.e., a hole punched or drilled into the bone into which a prosthetic device such as an implant may be received. The socket may be prepared at the desired target location using conventional instruments such as drills, taps, punches or equivalent hole-producing devices.

While certain procedures contemplate directly attaching the graft to the bone, the more common route involves the employment of an implant specially configured to hold and/or enable attachment of the graft to the boney tissue. As used herein, the term “implant” refers to a prosthetic device fabricated from a biocompatible and/or inert material. In the context of the present invention, examples of such “implants” include conventional and knotless anchors of both the screw-threaded and interference-fit variety.

In certain embodiments, the present invention contemplates fabrication of the implant from either a metallic material or a suitable polymeric material, including, but not limited to, polyetheretherketone (PEEK), a polymeric composite such as, for instance, carbon fiber reinforced PEEK (PEEK CF), or of a suitable bioabsorbable material such as, for instance, polylactic acid (PLA). The present invention also contemplates the use of very small knotless anchors produced from ceramic materials using a process known as “Ceramic Injection Molding” or simply “CIM”. The tensile strength of PEEK material is typically between 10,000 and 15,000 psi. In comparison, the tensile strength of alumina is generally in excess of 200,000 psi. Furthermore, recently developed materials such as Zirconia Toughened Alumina (ZTA) by Coorstek Inc. (Golden, Colo.) have a high degree of toughness in addition to high tensile strength. These materials, being ceramic, do not have a yield point and therefore do not deform under load. The high tensile strength and the absence of yielding under load of an implant constructed of such ceramic materials allow torque to be transmitted to the implant through features that are not producible by the machining of metal or that would fail in use if formed from a polymeric material such as PEEK.

In certain embodiments, the implant may take the form of a ceramic interference plug, wherein the high elastic modulus and high strength of the ceramic materials is beneficial for small and miniature interference type anchors that are driven axially into a prepared socket. The high modulus and high strength of the materials allows the thickness of the wall between the central lumen and the outer surface to be reduced compared to interference type anchors produced from polymeric materials without reducing the compressive force which retains the one or more sutures between the outer wall of the implant and the wall of the socket.

The preferred implant system of the present invention is comprised of an optionally cannulated tensioning device (also referred to as the “inserter” or “insertion device”) slidably received within the lumen of a cannulated driver device (also referred to as the implant driver) that together serve to tension sutures in a prepared socket for the placement of a simple one-piece cannulated anchor. In the Examples below, the present invention makes reference to various lock-and-key type mating mechanisms that serve to establish and secure the axial and rotational arrangement of these device components. It will again be readily understood by the skilled artisan that the position of the respective coordinating elements (e.g., recessed slots and grooves that mate with assorted projecting protrusions, protuberances, tabs and splines) may be exchanged and/or reversed as needed.

The implant placement system of the present invention requires a robust connection between the “driver device” and the associated “implant” or “anchor” so as to ensure that the two rotate as a single unit such that rotational force or “torque” applied to the proximal end of the system (e.g., via the proximal handle portion of the driver device) is transmitted to the distal end of the system (e.g., the distal end of the implant disposed in the prepared socket) without incident or interruption. This continuous “torque transfer” along the length of the system, from proximal to distal end, is critical to the function of the driver, enabling it to distally advance the implant and firmly secure the implant (and any associated sutures or tissues) in the biological site of interest. In the context of the present invention, this continuous torque transfer is achieved by means of coordinating “torque-transmitting” elements, namely a distal “torque-transmitting portion” of the driver device that is configured to mate with and/or conform to a “torque-transmitting” (or alternatively “torque-receiving” or “torque-transferring”) portion of the implant, such “portion” including at a minimum the proximal end of the implant though the present invention contemplates embodiments where “torque-transmitting” features on the implant extend along the length of the implant. The respective “torque-transmitting” features on the driver device and implant cooperate to ensure that any proximal torque applied by the user to the proximal handle portion of the device is directly conveyed (“transmitted”) to the distal end of the implant.

In certain embodiments, the torque-transmitting portion of the implant may take the form of a laterally extending slot in the proximal end of the implant similar to a standard screwdriver slot; however, other geometries are contemplated and described in detail herein as well as in disclosures incorporated by reference herein. In addition, like the implant itself, the distal torque-transmitting portion of the driver may also be fabricated from a ceramic material and formed by ceramic injection molding so as to allow miniaturization of the torque-transmitting features.

The present invention makes reference to insertion devices commonly referred to in the art as “drills” and “drivers”, i.e., devices that “drill” the socket and “drive” the implant into the socket. In the context of the present invention, the drills and drivers may be conventional, e.g., rigidly linear as previously herein described, or, as discussed in detail herein, “off-axis”, e.g., having an angularly offset distal portion adapted to drill off-axis sockets in boney tissues that are remote and difficult to access and drive therein the corresponding implant, such as an anchor or interference screw.

The present invention contemplates securing the graft to the implant via sutures. In the context of the present invention, the term “suture” refers to a thread-like strand or fiber used to hold body tissues after surgery. Sutures of different shapes, sizes, and thread materials are known in the art and the present invention is not restricted to any particular suture type. Accordingly, in the context of the present invention, the suture may be natural or synthetic, monofilament or multifilament, braided or woven, permanent or resorbable, without departing from the spirit of the invention.

In certain embodiments, the present invention makes reference to an elongate element of a superelastic and/or shape memory material configured to include a suture retention loop at its distal end and designed to be slidably received within a lumen of a cannulated tensioning device or inserter. In certain preferred examples, the elongate element takes the form of a “nitinol wire”. In the context of the present invention, “nitinol” is a super elastic metal alloy of nickel and titanium. In a preferred embodiment, the two elements are present in roughly equal atomic percentage (e.g., Nitinol 55, Nitinol 60). Nitinol alloys exhibit two closely related and unique properties: shape memory effect (SME) and superelasticity (SE; also called pseudoelasticity, PE). Shape memory is the ability of nitinol to undergo deformation at one temperature, then recover its original, undeformed shape upon heating above its “transformation temperature”. Superelasticity occurs at a narrow temperature range just above its transformation temperature; in this case, no heating is necessary to cause the undeformed shape to recover, and the material exhibits enormous elasticity, some 10-30 times that of ordinary metal.

The present invention also makes reference to high strength polymeric materials and high tensile strength ceramic materials, such as alumina or zirconia, that may be formed to complex shapes by a process referred to as Ceramic Injection Molding (CIM). In this process, ceramic powder and a binder material are molded to a shape that is subsequently fired in a furnace to eliminate the binder material and sinter the ceramic powder. During this sintering operation the item is reduced in size by twenty to thirty percent and achieves near 100% density with very high dimensional repeatability. Ceramic materials that are routinely molded and thus contemplated by the present invention include, but are not limited to, alumina, zirconia toughened alumina (ZTA) and partially stabilized zirconia (PSZ). The flexular strengths of these materials range from 55,000 psi to 250,000 psi, far higher than the 25,000 psi flexular strength of implantable PEEK material.

The instant invention has both human medical and veterinary applications. Accordingly, the terms “subject” and “patient” are used interchangeably herein to refer to the person or animal being treated or examined. Exemplary animals include house pets, farm animals, and zoo animals. In a preferred embodiment, the subject is a mammal, more preferably a human.

Hereinafter, the present invention is described in more detail by reference to the Figures and Examples. However, the following materials, methods, figures, and examples only illustrate aspects of the invention and are in no way intended to limit the scope of the present invention. For example, while the present invention makes specific reference to arthroscopic procedures, it is readily apparent that the teachings of the present invention may be applied to other minimally invasive procedures and are not limited to arthroscopic uses alone. As such, methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention.

EXAMPLES

The present invention attempts to address these afore-noted problems in the art. To that end, FIGS. 1A through 1C and 2A and 2B depict a cannulated driver 1500 for a knotless anchor system of the instant invention. Driver 1500 has a proximal handle 1502 in which is formed a proximal cylindrical recess 1504, and off-axis lateral holes 1506, and a tubular distal portion 1510 having at its distal end tubular drive element 1512. The distal portion 1514 of drive element 1512 is configured to be complementary to internal drive features 1602 in the proximal portion of the lumen of cannulated threaded anchor 1600; accordingly, torque supplied by driver 1500 is transmitted to anchor 1600. The distal portion of drive element 1512 may be fabricated in a variety of sizes, shapes, configurations and lumen sizes to suit a variety of anchors 1600, the requirements for a particular anchor 1600 depending on its size, configuration and material properties. For example, the complementary drive elements may take the form of an internally or externally positioned hexagonal or square drive, an internal or external spline, or slots positioned internal or external to the anchor. However, the present invention contemplates alternate cooperating configurations and thus is not limited to any one particular embodiment.

Referring now to FIGS. 3 through 9, cannulated tensioning device 1400 has a proximal hub 1402 with a distal cylindrical portion 1404 in which are formed off-axis lateral grooves 1406, and cleats 1408 formed in the proximal rim of proximal hub 1402. Tensioning device 1400 has a tubular middle portion 1410, and a tubular distal portion 1412, distal portion 1412 having a diameter 1414 and length 1416. Diameter 1414 is selected such that distal portion 1412 may be slidably positioned within distal drive element 1512 of cannulated driver 1500. Length 1416 is determined such that when tensioning device 1400 is positioned within the lumen of the cannulated driver 1500, distal portion 1412 of tensioning device 1400 protrudes beyond distal drive element 1512 of driver 1500 a sufficient distance so that when anchor 1600 is mounted on distal drive element 1512 and distal portion 1412 is inserted to the full depth of a suitable socket formed in bone, anchor 1600 is still proximal to and clear of the socket. Elongate wire element 1302 having at its distal end loop 1304 and at its proximal end polymeric element 1306 forming a pull tab forms a loading loop 1300 for drawing sutures into the lumens of tubular members 1410 and 1412.

FIGS. 10 and 11 depict an illustrative embodiment of removable key 1200 that may serve to prevent relative axial and rotational movement between the cannulated driver and the tensioning device. In this embodiment, key 1200 has a planar portion 1202 and cylindrical portions 1204 that are sized and spaced such that cylindrical portions 1204 may be inserted into off-axis lateral holes 1506 of handle 1502 of cannulated driver 1500.

FIG. 12 depicts cannulated driver 1500 with anchor 1600 loaded thereto, tensioning device 1400 with loading loop 1300 positioned for loading a suture, and key 1200 prior to mounting of driver 1500 to tensioning device 1400 in preparation for use. When driver 1500 is mounted to tensioning device 1400, off-axis slots 1406 of handle 1402 of tensioning device 1400 are aligned with off-axis holes 1506 of handle 1502 of driver 1500 and cylindrical portions 1204 of key 1200 are inserted into the passages so formed. Positioning of key 1200 in this manner prevents axial and rotational movement of tensioning device 1400 relative to driver 1500. FIGS. 13 through 19 depict knotless suture anchor system 1000 of the instant invention prepared for use with key 1200 and loading loop 1300 in place.

Sutures 1800 are loaded into system 1000 by placing the proximal ends of sutures 1800 in distal loop 1304 of loading loop 1300 as depicted in FIG. 20. Tab 1306 of loading loop 1300 is withdrawn proximally until proximal ends 1802 of sutures 1800 extend proximally beyond hub 1402 of tensioning device 1400 as depicted in FIG. 21.

The present invention may be used to secure any type of soft tissue, graft, or tendon, such as, for example, a biceps tendon or a rotator cuff. An illustrative method of fixation according to the principles of the instant invention is depicted in FIGS. 22 through 32. FIG. 22 schematically depicts a socket 32 formed by drilling or punching in bone 30, and a graft 20 to be affixed to bone 30. Sutures 1800 are passed through graft 20 in a usual manner; and the sutures loaded into system 1000 as previously described and depicted in FIGS. 20 and 21, such that suture proximal ends 1802 are accessible to the surgeon. Subsequently, distal tubular portion 1412 of tensioning device 1400 is inserted into socket 32 as depicted in FIGS. 23 through 25, the distal end of tubular portion 1412 contacting the bottom surface of socket 32. Thereafter, referring to FIGS. 26 through 28, the surgeon grasps proximal ends 1802 of sutures 1800 and withdraws them proximally so as to advance graft 20 towards socket 32. When graft 20 is in the desired position, proximal ends 1802 of sutures 1800 are secured in cleats 1408 to maintain the graft position. So long as proximal ends 1802 of sutures 1800 remain securely cleated and the distal end of tubular element 1412 is maintained in contact with the bottom surface of socket 32, the position of graft 20 will not change. The surgeon may adjust sutures 1800 as required to achieve optimal placement of graft 20. When this optimal placement of graft 20 has been achieved, while maintaining contact between the distal end off distal tubular element 1412 and the bottom of socket 32, the surgeon removes key 1200 from system 1000 so as to allow axial and rotational movement of driver 1500. The surgeon then advances anchor 1600 to socket 32 and screws the anchor into socket 32 so as to trap sutures 1800 between anchor 1600 and the wall of socket 32 in bone 30 as depicted in FIGS. 29 through 31. When anchor 1600 is fully inserted in socket 32, proximal ends 1802 of sutures 1800 are released from cleats 1408 and system 1000 is withdrawn from the joint, leaving the repair site as depicted in FIG. 32. Subsequently sutures 1800 are cut adjacent to anchor 1600 and the anchor placement is complete.

In an alternate method for anchor placement according to the present invention, the process may be simplified through use of an alternate embodiment system of the present invention in which the sutures are not drawn into a cannulation of the tensioning device, but rather are positioned and retained within a forked portion formed at the distal end of the tensioning device. In this alternate embodiment, sutures do not enter the lumen of the cannulated anchor, but rather wrap around the distal end of the anchor during insertion and are retained in place by friction between the external surfaces of the anchor and the boney surface of the socket at laterally opposed locations.

Alternate embodiment anchor placement system 2000, depicted in FIGS. 33 through 42, is identical to system 1000 in all aspects except as specifically subsequently described. Specifically, cannulated distal tubular element 1412 of system 1000 is replaced by distal element 2442 that is not cannulated and has formed at its distal end elongate laterally opposed, distally extending portions 2444 with sharpened distal ends 2448. Elongate portions 2444 form the tines of a fork with channel 2446 formed between portions 2444. Tensioning device handle 2402 has formed near the distal end of its external surface flanges 2430 wherein are formed slots 2432 which serve as cleats for maintaining the tension of sutures placed therein, flanges 2430 and slots 2432 replacing slots 1408 in hub 1402 of system 1000.

A method of fixation according to the principles of the instant invention using system 2000 is depicted in FIGS. 43 through 48. A socket 2032 is formed by drilling or punching in bone 2030. Sutures 2800 are passed through graft 2020 in a usual manner. Sutures 2800 are positioned within channel 2446 at the distal end of distal element 2442 of the tensioning device and distal element 2442 is inserted into socket 2032 such that the distal end of elongate portions 2444 contact the bottom of the socket as depicted in FIGS. 43 and 44. Thereafter, referring to FIGS. 45 and 46, the surgeon grasps proximal ends 2802 of sutures 2800 and withdraws them proximally so as to advance graft 2020 towards socket 2032. When graft 2020 is in the desired position, proximal ends 2802 of sutures 2800 are secured in cleats 2432 in flanges 2430 of handle 2402 to maintain the graft position. So long as proximal portions 2802 of sutures 2800 remain cleated and the distal end of distal tensioning element 2442 is maintained in contact with the bottom surface of socket 2032, the position of graft 2020 will not change. The surgeon may adjust sutures 2800 as required to achieve optimal placement of graft 2020. When this optimal placement of graft 2020 has been achieved, while maintaining contact between the distal end off distal tubular element 2442 and the bottom of socket 2032, the surgeon removes key 2200 from system 2000 so as to allow axial and rotational movement of the driver assembly. The surgeon advances anchor 2600 to socket 2032 and screws the anchor into socket 2032 so as to trap sutures 2800 between anchor 2600 and the walls of socket 2032 in bone 2030 as depicted in FIG. 47. When anchor 2600 is fully inserted in socket 2032, proximal portions 2802 of sutures 2800 are released from cleats 2432 and system 2000 is withdrawn from the joint. Subsequently suture proximal portions 2802 of sutures 2800 are cut adjacent to anchor 2600 and the anchor placement is complete. The position of the graft is maintained by friction between the sutures 2800 that are trapped between the exterior surface of anchor 2600 and two laterally opposed portions of the walls of socket 2032.

Anchor placement systems of the present invention are also useful for the attachment of tendons in a procedure called bio-tenodesis. When attaching, for instance, a biceps tendon to the humeral shaft, the proximal end of the tendon is inserted into the socket and the implant placed in a manner that traps the tendon between the anchor and the wall of the socket thereby retaining the tendon in the socket.

FIGS. 49 through 52 depict an alternate embodiment method for fixation of a tendon graft using system 2000. As is commonly done in preparation for a bio-tenodesis type procedure, the portion of the graft that is to be inserted into the socket is first sutured in a circumferential manner, the sutures providing added resistance to pull-out when the repair is completed. Excess suture from the circumferential suturing (also called “whip stitching”) is used to position the tendon prior to anchoring by the implant. Unlike previous embodiment methods disclosed herein, the positioning of graft 3020 is not achieved by tensioning the sutures after distal element 3442 is inserted into socket 3032. Rather, as depicted in FIG. 49 sutures 3802 are positioned within channel 3446 at the distal end of distal element 3442 of the tensioning device and tensioned such that graft 3020 is positioned and retained adjacent to the distal end of distal element 3442 adjacent to distally extending portions 3444. Tension in sutures 3802 is then maintained by cleating in the manner previously herein described. Thereafter, distal element 3444 is inserted into socket 3032 as shown in FIG. 50 and anchor 3600 is placed as depicted in FIG. 51 trapping graft 3020 between anchor 3600 and the boney surface of the wall of socket 3032 at a first location, and trapping sutures 3082 between anchor 3600 and the boney surface of the wall of socket 3032 at a second location. Friction forces acting at these locations maintain the position of graft 3020 relative to socket 3032 and bone 3030. FIG. 52 depicts the site at completion of the anchor placement and removal of insertion system 3000.

FIGS. 53 through 57 depict an alternate embodiment method of anchoring a graft to bone using the alternate anchor placement system 2000 of the present invention. Rather than using tensioned sutures to maintain the placement of a graft at the distal end of distal element 3442 as previously depicted in FIG. 49, the graft is impaled on the distally extending portions 3444 of distal element 3442 as shown in FIGS. 53 and 54, the sharpened distal ends 3448 of extending portions 3444 penetrating the graft. Thereafter, distal element 3444 is inserted into socket 3032 as shown in FIG. 55 and anchor 3600 is placed as depicted in FIG. 56 trapping graft 3020 between anchor 3600 and the boney surface of the wall of socket 3032. Friction force between the inserted portion of graft 3020 and socket 3032 maintains the position of graft 3020 relative to socket 3032 and bone 3030. FIG. 57 depicts the site at completion of the anchor placement and removal of insertion system 3000. If the graft has been whip-stitched and the excess suture remains, the suture tails will also be trapped between anchor 3600 and socket 3032 thereby providing additional resistance to pull out.

FIGS. 58 through 63 depict yet another alternate method for securing a ligament graft to bone using anchor system 2000. As in the previous embodiments, sutures are not used to position and tension the graft 3020 in socket 3032. Rather, as in the previous method, graft 3020 is impaled on the distally extending portions 3444 of distal element 3442 as shown in FIGS. 58 and 59, the sharpened distal ends to of extending portions 3444 penetrating the graft. The site for penetration is selected such that when the ligament is inserted to the bottom of socket 3032 the proximal end of graft 3020 protrudes above the rim of socket 3032. As seen in FIG. 60, graft 3020 is positioned above socket 3032, inserted as shown in FIG. 61, and anchor 3600 placed as shown in FIG. 62. FIG. 63 shows the completed repair. Graft 3020 is trapped between the exterior surface of anchor 3600 and first and second laterally opposed portions of the wall of socket 3032 and retained in position by friction therefrom.

It may be useful to determine the tension in a tendon undergoing a tenodesis procedure so that optimal tension may be selected based on the particular anatomy. In another embodiment of the instant invention, the inner tensioning member is provided with a mechanism that indicates the force being applied to the graft during insertion into the socket. The insertion site on the graft may be adjusted such that when the graft is inserted to the bottom of the socket the predetermined optimal tension is achieved, and thereafter maintained during anchor placement.

FIGS. 64 through 69 depict a distal assembly 4401 for a force indicating mechanism for use with an inner tensioning assembly in accordance with the present invention. Elongate tubular element 4410 has at its distal end distal element 4442, identical to distal element 3442 (FIGS. 36 through 40), and at its proximal end element 4450 affixed thereto. Element 4450 has a cylindrical outer surface portion 4452 and a planar outer surface portion 4454. The proximal end of tubular element 4410 is then positioned within lumen 4456. Recess 4458 extends distally from proximal-most surface 4451.

FIGS. 70 to 74 depict a handle 4402 for a force indicating inner tensioning assembly. Handle 4402 is identical to handle 2402 in all aspects except as subsequently described. Specifically, handle 4402 has a distal lumen 4491 with a diameter that allows tubular element 4410 to be slidably positioned therein. Recess 4496 extends distally from proximal-most surface 4403 of handle 4402 and has a cylindrical surface portion 4497 and a planar portion 4498 sized such that element 4450 may be positioned therein. This construction is such that when distal assembly 4401 is assembled to handle 4402 with element 4450 positioned within recess 4496 and tubular member 4410 is positioned within lumen 4491 of handle 4402, distal assembly 4401 may be move axially relative to handle 4402 but rotation is prevented. Handle 4402 has a window 4490 formed in its top surface with adjacent beveled surfaces 4492 so that recess 4496 and elements therein may be viewed.

FIGS. 75 through 79 depict a proximal end cap 4700 for handle 4402. End cap 4700 has a distal portion 4702 with proximally extending recess 4704, and a proximal portion 4706. Distal portion 4702 is configured for assembly to handle 4402.

Referring now to FIGS. 80 through 84 which depict a force-indicating anchor system 4000 of the instant invention, distal assembly 4401 may be assembled to handle 4402 as previously described, and end cap 4700 is assembled to the proximal end of handle 4402. Spring 4900 is positioned therebetween with its distal end in recess 4458 of element 4450 and its proximal end in recess 4704 of end cap 4700. As seen in FIG. 81, indicia 4470 are formed on beveled surfaces 4492 such that the position of proximal-most surface 4451 of element 4450 visible through window 4490 may be quantified. The position of element 4450 and its proximal-most surface 4451 is determined by the amount of deflection of spring 4900, which is in turn determined by the force exerted on distal assembly 4401. This force is exerted on distal assembly 4401 by tension in the graft during insertion into a socket by distal element 4442. Device 4000 may be calibrated so that during insertion of the graft into the socket by the surgeon, by observing the position of proximal-most surface 4451 relative to the indicia, will know the insertion force and thereby the tension in the graft.

When using embodiments previously herein described, the inner member/tensioning device is maintained in a non-rotating condition by the surgeon's hand on the proximal hub of the tensioning device/inner assembly. The surgeon's hand on the proximal hub also maintains contact between the distal end of the tensioning device and the bottom of the prepared socket by applying distal force to the hub. To advance the outer assembly/driver and the implant removably mounted thereto to the prepared socket and to place the implant therein, the surgeon must first uncouple the driver from the tensioning device, then move the driver axially to position the implant at the socket, and must then screw the implant into the socket. The requires the use of both of the surgeon's hands since when doing these actions with the driver, the surgeon must maintain the position of the tensioning device.

However, other embodiments of the present invention contemplate performance of these functions with a single hand. For example, rather than being supplied by the surgeon's hand, the forward force on the tensioning member/inner assembly may alternatively be supplied by an elastic member that is part of the inner assembly. Rotation of the inner tensioning assembly is prevented by contact between the distal end of the tensioning and the bottom surface of the prepared socket in which the implant is to be placed.

FIGS. 85 through 88 depict driver/outer assembly 5500 and implant 5600 for an alternate embodiment implant placement system of the present invention configured for one-handed operation by a surgeon. Driver 5500 and implant 5600 are identical in all aspects of form to driver 1500 and implant 1600 (FIGS. 1 through 2B) except as hereafter specifically described. For example, off-axis holes 1506 of handle 1502 of driver 1500 are eliminated, as are the planar regions in which they intersect. Proximal cylindrical recess 5504 extends distally to intersect vertical cylindrical recess 5534 that is configured to receive a slidable control element, the upper portion of vertical recess 5534 being configured to receive retainer 5530 with coaxial opening 5532.

Inner assembly 5400, depicted in FIGS. 89 through 91B, is identical in form to tensioning device/inner assembly 1400 depicted in FIGS. 3 through 8 except as specifically hereafter described. For example, the distal cylindrical portion 1404 with off-axis lateral grooves 1406 of hub 1402 of tensioning device 1400 is eliminated. In its stead, inner tensioning assembly 5400 has distally adjacent to hub 5402, assembly 5450 formed of proximal element 5452 and distal element 5458 with spring 5454 positioned therebetween as depicted in FIG. 91A. Proximal element 5452 and distal element 5458 are rotatably and slidably positioned on tubular middle portion 5410. Positioned distal to distal element 5458 and separated therefrom by washer 5462 (FIG. 91B), element 5456 is affixed to tubular middle portion 5410. Element 5456 has a proximal portion 5476, a middle portion 5470 of reduced diameter forming a circumferential channel bounded by proximal wall 5466 and distal wall 5468, and a distal portion 5472 having a distal end on which is formed chamfer 5474.

FIGS. 92 and 93 depict a slidable control element 5200 configured to be slidably received within vertical cylindrical recess 5534 of handle 5502 of driver 5500, and retained therein by retainer 5530. Control element 5200 has an upper portion 5210 sized to be slidably received within opening 5532 of retainer 5530, a mid portion 5212 and a lower portion 5220. Mid portion 5212 has formed therein symmetrically opposed first (distal) flat 5216 and second (proximal) flat 5214 with cylindrical hole 5218 extending therebetween.

The elements of this alternate embodiment implant placement system 5000 of the present invention comprising outer driver assembly 5500, inner tensioning assembly 5400, and control element 5200 are depicted in FIG. 94. Slidable control element 5200 with spring 5230 is inserted into vertical cylindrical recess 5534 and retained therein by retainer 5530. Inner assembly 5400 is inserted into proximal cylindrical recess 5504 and proximal element 5452 is affixed to the proximal end of handle 5502.

FIGS. 95 through 99 depict implant placement system 5000 assembled and ready for use. Proximal element 5452 of inner assembly 5450 (see FIG. 94) is affixed to the proximal end of outer driver assembly 5500 handle 5502. Control element 5210 is depicted in a first position wherein upper portion 5210 of control element 5200 protrudes above the top surface of retainer 5530 and is maintained in that position by spring 5230. In this first position, distal travel of outer driver assembly 5500 relative to inner tensioning assembly 5400 is constrained by contact between distal facing surface 5466 of proximal portion 5476 of element 5456 and proximal surface 5214 of control element 5210, and initial compression being imparted to spring 5454 thereby. Distal element 5412 of inner tensioning assembly 5400 protrudes beyond implant 5600 a sufficient distance to reach to bottom of a prepared socket while implant 5600 remains proximal to the socket. As depicted in FIGS. 98A through 98C, when a proximal force is applied to distal element 5412 of inner assembly 5400 as when tensioning sutures for implant placement, proximal motion of inner tensioning assembly 5400 relative to outer driver assembly 5500 is prevented by contact between proximal surface 5468 of distal portion 5472 of element 5456 affixed to tubular middle portion 5410, and distal surface 5216 of control element 5210.

Applying a downward force to slide control 5200 sufficient to compress spring 5230 brings opening 5218 in slide control mid portion 5212 into coaxial alignment with tubular mid portion 5410 and element 5456 mounted thereto such that distal portion 5472 of element 5456 may pass therethrough allowing outer driver assembly 5500 to advance distally relative to inner tensioning assembly 5400 to its distal limit as depicted in FIGS. 100 through 104. Spring 5454 is compressed as depicted in FIG. 103. When slide 5200 is positioned as shown, outer driver assembly 5500 may be advanced distally with resistance to this axial movement provided by force supplied by spring 5454. Outer driver assembly 5500 may also be simultaneously freely rotated relative to inner tensioning assembly 5400. Referring to FIGS. 98B and 98C, distal element 5458, washer 5462 and proximal portion 5476 of element 5456 together form a bearing, distal element 5456 and washer 5462 being formed of a metallic material and optionally having a suitable lubricant applied to their mating surfaces as well as on tubular mid portion 5410 of inner tensioning assembly 5400.

Implant placement system 5000 places implant 5600 in the same manner as system 1000 in that sutures passing through the graft are tensioned using a non-rotating distal tensioning element that protrudes distally beyond the implant a sufficient distance to allow the distal end of the distal tensioning element to reach the bottom of a prepared socket with the implant remaining proximal to the socket. Unlike system 1000, in which rotation of inner tensioning assembly 1400 is prevented by the surgeon's control of hub 1402, prevention of rotation of inner tensioning assembly 5400 is prevented by cooperative interaction between the distal end 5413 of distal element 5412 of inner tensioning member 5400 and the cortical bone at the bottom of the socket. The consistency of the cortical bone at the bottom of a socket is such that it may be deformed by distal end 5413 of distal element 5412 and by sutures passing into the cannulation of distal element 5412 due to axial force applied by the surgeon. This deformation increases the frictional resistance to rotation of distal element 5412 and inner tensioning assembly 5400 of which it is a part. This resistance to rotation may be further enhanced through the forming of suitable contours on distal end 5413 of distal element 5412 so as to create features that may penetrate the cortical bone or create localized depressions therein. These contours may include, for instance, protuberances, grooves, or curvilinear shapes. Like implant system 1000, system 5000 has cleats 5408 formed in inner tensioning assembly hub 5402 for maintaining the tension on sutures during placement of the implant. In other embodiments, cleats 5408 are not formed in hub 5402 and the suture tension is maintained through friction between the cortical bone at the bottom of the socket and distal end 5413 of distal tensioning element 5412 between which it is trapped.

When placing anchor 5600, the surgeon does not control inner tensioning assembly 5400 through hub 5402, but rather controls placement process exclusively through handle portion 5502 of outer driver assembly 5500 and slide control 5320.

When using implant placement system 5000, suture is loaded into tensioning inner assembly 5400 as depicted in FIGS. 20 and 21 for implant system 1000. Thereafter, anchor 5600 is placed as depicted in FIGS. 22, 25, 28, 31 and 32. In figures referenced in the following description, depicted elements of implant system 1000 designated as “1XXX” may be replaced by their corresponding elements of implant system 5000 designated as “5XXX”. FIG. 22 schematically depicts a socket 32 formed by drilling or punching in bone 30, and a graft 20 to be affixed to bone 30. Sutures 1800 are passed through graft 20 in a usual manner; and the sutures loaded into system 5000 as previously described and depicted in FIGS. 20 and 21, such that the suture proximal ends are accessible to the surgeon. Subsequently, distal tubular portion 5412 of tensioning inner assembly 5400 is inserted into socket 32 as depicted in FIGS. 23 through 25, the distal end of tubular portion 5412 contacting the bottom surface of socket 32. Thereafter, referring to FIGS. 26 through 28, the surgeon grasps the proximal ends of sutures 1800 and withdraws them proximally so as to advance graft 20 towards socket 32. When graft 20 is in the desired position, the proximal ends of sutures 1800 are secured in cleats 5408 (FIG. 95) to maintain the graft position. So long as the proximal ends of sutures 1800 remain securely cleated and the distal end of tubular element 5412 is maintained in contact with the bottom of socket 32, the position of graft 20 will not change. The surgeon may adjust sutures 1800 as required to achieve optimal placement of graft 20. When this optimal placement of graft 20 has been achieved, while applying distal force to handle 5502 of implant system 5000 so as to maintain contact between the distal end off distal tubular element 5412 and the bottom of socket 32, the surgeon moves slide control 5300 to its second position (see FIG. 103) thereby allowing outer driver assembly 5500 with implant 5600 mounted thereto to be moved distally so as to bring implant 5600 to socket 32, and to be rotated so as to then thread implant 5600 into socket 32 so as to trap sutures 1800 between anchor 5600 and the wall of socket 32 in bone 30 as depicted in FIG. 31. When anchor 5600 is fully inserted in socket 32, the proximal ends of sutures 1800 are then released from cleats 5408 and system 5000 is withdrawn from the joint, leaving the repair site as depicted in FIG. 32. Subsequently sutures 1800 are trimmed adjacent to anchor 5600 and the anchor placement is complete. Upon withdrawal of implant placement system 5000 from the site, outer driver assembly 5500 is returned to its proximal position (FIGS. 95 through 99) by force supplied by spring 5454, chamfered end 5474 of distal portion 5472 of element 5456 and opening 5218 cooperatively acting to return control slide 5200 to its first position.

The initial compression applied to spring 5454 when assembled as shown in FIGS. 95 through 99, with outer driver assembly 5500 in its proximal-most position, is sufficient to ensure that, after tensioning sutures 1800 in socket 32 prior to placing implant 5600, when slide control 5320 is moved to its second position to allow outer driver assembly 5500 to move distally to bring the implant to the socket and to screw the implant into the socket, distal end 5413 of distal tensioning element 5412 remains firmly in contact with the cortical bone at the bottom of socket 32 so as to prevent rotation of inner tensioning assembly 5400.

In the method of implant placement previously described using placement system 5000, the tension in sutures 1800 and graft position are maintained by removably storing the suture proximal ends in cleats 5408 of inner tensioning assembly 5400. In an alternate method for placing anchor 5000, the tension in sutures 1800 and graft position are maintained by the surgeon applying tension to the proximal ends of sutures 1800, or by friction force applied to the portions of sutures 1800 trapped between distal end 5413 of distal tensioning element 5412 and the cortical bone at the bottom of socket 32, or by a combination of these two methods.

In an alternate embodiment, a loop of an elongate element such as, for instance, nitinol wire may be formed distal to the distal end 5413 of distal tensioning element 5412 (see FIG. 99) with the proximal ends of the elongate element removably secured in cleats 5408 of hub 5402. Sutures may be loaded into the nitinol loop, tensioned, and secured by an anchor, whereupon the elongate element is removed. This method of implant placement is described in detail in the above-referenced co-pending and contemporaneously filed application entitled “Ceramic Implant Placement Systems And Superelastic Suture Retention Loops For Use Therewith” [Attorney Docket No. TEN-004CIP2], the contents of which have been previously incorporated by reference in their entirety.

FIG. 105 shows an exploded assembly of the elements of an alternate embodiment implant placement system of the present invention. Implant placement system 6000 is identical in all aspects of form and function to implant placement system 5000 except as specifically described hereafter. For example, cannulated distal tensioning element 5412 of system 5000 is replaced by distal tensioning element 6412 which is alike to distal element 2412 (FIGS. 36 through 38) of implant placement system 2000. Spring 5230 (FIG. 94) is eliminated such that slide control 6200 may be positioned and remain in a first position in which axial motion of outer driver assembly 6500 is prevented (FIGS. 106 through 110), or may be placed and remain in a second position in which the outer driver assembly 6500 may be advanced distally against force supplied by spring 6454 (FIGS. 111 through 115). Hub 5402 of inner tensioning assembly 5400 is eliminated, the rotation of inner assembly 6400 being controlled not by the surgeon's hand on a proximal hub, but rather through interaction between the distal end of distal tensioning element 6412 and the cortical bone at the bottom of the prepared socket. Maintaining the position of the distal end of distal tensioning element 6412 at the bottom of the prepared socket is not accomplished through distal force applied to a hub like hub 2402 of the inner tensioning assembly 2400 as when using implant placement system 2000, but rather through distal force applied to handle 6502 of outer driver assembly 6500 and an elastic element acting between inner tensioning assembly 6400 and outer driver assembly 6500.

FIGS. 106 through 110 depict slide control 6200 in a first position with its topmost surface 6201 protruding above the top surface of retainer 6530. In this configuration, distal axial movement of outer tensioning assembly 6500 is prevented by interaction between slide control 6200 and element 6456 of inner tensioning assembly 6400 in the manner previously herein described with reference to implant placement system 5000. As with implant placement system 2000 (FIGS. 33 to 42), distal tensioning element 6412 has formed thereon distally extending portions 6444 separated by a gap 6446, distally extending portions 6444 having sharpened distal ends 6448, the distal end of distal tensioning element 6412 having the form of a fork. Sharpened distally extending portions 6444 are configured so as to be able to pierce tissue or cortical bone, and gap 6446 is configured so that sutures placed therein may be made to slide smoothly for the purpose of tensioning a graft.

With slide control in its second position as depicted in FIGS. 111 through 115, outer driver assembly 6500 of implant placement system 6000 may be moved distally so as to bring implant 6600 mounted thereto to a prepared socket after the position of a graft is established, and subsequently threaded into the socket. Top surface 6201 of slide control 6200 is coplanar with the upper surface of retainer 6530 while bottom surface 6203 of slide control 6500 protrudes beyond the adjacent surface portion of handle 6502 of outer driver assembly 6500. To summarize, with slide control 6200 in its first position, axial movement of driver assembly 6500 is prevented. With slide control 6200 in its second position driver assembly 6500 rotates freely and may be moved distally relative to inner tensioning assembly 6400, the axial motion being resisted by spring 6454. Slide control 6200 is not returned to its first position by a spring, but rather will remain in its second position until returned to its first position by the surgeon.

The method for placing an implant in accordance with the principles of the present invention is the same as the method when using implant placement system 2000 and depicted in FIGS. 44 and 46 through 48 except as subsequently herein described. To that end, in figures referenced in the following description, depicted elements of implant system 2000 designated as “2XXX” may be replaced by their corresponding elements of implant system 6000 designated as “6XXX”. Slide control 6200 of implant placement system 6000 is initially in its first position and the condition of system 6000 is as depicted in FIGS. 106 through 110. Sutures 2802 are captured in gap 6446 between distally extending portions 6444 at the distal end of distal tensioning element 6412 (see FIG. 106B) and inserted with distal tensioning element 6412 into socket 2032 as depicted in FIG. 44. Thereafter, as shown in FIG. 46, tension is applied to sutures 2802 to bring graft 2000 to the present position. The surgeon maintains this tension so as to maintain the graft position. The surgeon then moves slide control 6200 to its second position and advances outer driver assembly 6500 with implant 6600 mounted thereto distally to bring implant 6600 to socket 2032, and then threads implant 6600 into socket 2032 as shown in FIG. 47. Distal force applied to implant placement system 6000 via handle 6502 of outer driver assembly 6500 causes sufficient interference between distal end features of distal tensioning element 6412 to prevent rotation of inner tensioning assembly 6400 during subsequent threading of anchor 6600 into socket 2032. Compression of spring 6454 of inner tensioning assembly 6400 applies sufficient distal force to ensure that contact is maintained between the distal end of distal tensioning element 6412 and the cortical bone at the bottom of socket 2032. With implant 6600 threaded into position as depicted in FIG. 47, the condition of implant system 6000 is as depicted in FIGS. 111 through 115. FIG. 48 depicts the site at the completion of implant placement.

With slide control 6200 in its first position, axial movement of driver assembly 6500 of implant placement system 6000 is prevented. With slide control 6200 in its second position driver assembly 6500 rotates freely and may be moved distally relative to inner tensioning assembly 6400, the axial motion being resisted by spring 6454. Slide control 6200 is not returned to its first position by a spring, but rather may remain in its second position thereby giving the surgeon the option of inserting distal tensioning element 6412 into a prepared socket and positioning the graft through the adjustment of suture tension while relying solely on the force supplied by spring 6454. The resisting force supplied to outer driver assembly 6500 by spring 6454 is sufficient to allow tensioning of sutures as previously herein described.

Implant placement system 6000 is depicted with inner assembly 6400 having distal tensioning element 6412 with its distally extending portion 6444. Inner assembly 6400 may be replaced by inner assembly 5400 with its cannulated distal tensioning element 5412 and hub 5402 without departing from the principles of the present invention.

An alternate embodiment of the present invention incorporating a simplified construction is depicted in FIGS. 116 through 126. Implant placement system 7000 is identical in form and function to implant placement system 6000 except as specifically described hereafter. For example, control slide 6200 of implant placement system 6000 is eliminated so that outer driver assembly 7500 of placement system 7000 may be advanced distally in the same manner as outer driver assembly 6500 of implant placement system 6000 when control slide 6200 is in its second position. Implant 7600 is a push-in (interference plug) type anchor which does not have a helical thread formed on its outer surface, but rather a plurality of tapered portions (best seen in FIG. 121). Implant 7600 has a planar proximal-most surface. Distal element 7512 of outer driver assembly 6500 has a planer distal-most surface configured for transmitting axial force to implant 7600 during the placement of implant 7600. Push-in type implants and their use with embodiments of the present invention are described in the above-referenced co-pending and contemporaneously filed application entitled “Ceramic Implant Placement Systems And Superelastic Suture Retention Loops For Use Therewith” [Attorney Docket No. TEN-004CIP2], the contents of which have been previously incorporated by reference in their entirety. As noted elsewhere herein, push-in implants of the present invention may be formed of high strength ceramic materials.

FIG. 116 is a perspective view of an exploded assembly of the elements of implant placement system 7000. Outer driver assembly 7500 is of a simple form with no external control means. FIGS. 117 to 121 depict implant placement system 7000 with outer driver assembly 7500 in its fully proximal position, maintained therein by spring 7454 of inner tensioning assembly 7400. As seen in FIG. 120, element 7456 does not have features for cooperative engagement with a slide control, but rather has a planar distal surface 7457. Cylindrical recess 7504 of outer driver portion handle 7502 has a distal-most surface 7505 which, together with distal surface 7457 of element 7456, establishes the proximal limit of travel of outer driver assembly 7500 relative to inner tensioning assembly 7400. As with implant placement systems 5000 and 6000, the force supplied by spring 7454 is sufficient to prevent distal travel of outer driver assembly 7500 during tensioning of sutures for positioning of a graft.

FIGS. 122 through 126 depict implant placement system 7000 with outer driver assembly at the distal limit of its travel as when implant 7600 is fully placed in a prepared socket. Upon removal of implant placement system 7000 from the site at the completion of placement of implant 7600, outer driver assembly 7500 returns to its proximal-most position as depicted in FIGS. 117 to 121.

Implant placement system 7000 is used in the same manner as system 6000 previously herein described except as subsequently described. For example, the surgeon is not required to move slide control 6200 to its second position prior to advancing implant 7600 to the prepared socket. The surgeon is thus able to place implant 7600 with a first hand supplying tension to the sutures for graft positioning, and a second hand, via handle 7502 of outer tensioning assembly 7500, inserting distal tensioning element 7412 into a prepared socket, and thereafter maintaining the position of element 7412 during positioning of a graft. When the graft is properly positioned, implant 7600 is incrementally driven axially into the prepared socket by repeatedly impacting proximal end cap 7452 with a mallet. When implant 7600 is fully inserted, placement system 7000 is removed from the site and the repair is completed.

While methods of use of implant systems 5000, 6000 and 7000 have been described with reference to placing an implant so as to maintain a graft position by the trapping of sutures between the implant and at least one wall of the socket, these systems may also be used for bio-tenodesis procedures as depicted in FIGS. 49 through 52, FIGS. 53 through 57, and FIGS. 58 through 63 as well as other embodiments contemplated by the present invention.

INDUSTRIAL APPLICABILITY

As noted previously, there is a need in the art for simplified placement systems and methods for tissue graft anchors by which the surgeon may introduce one or more sutures into a prepared socket in the boney tissue, apply tension to the sutures to advance a soft tissue graft to a desired location, and then advance an anchor into the bone while maintaining suture tension. The present invention addresses this need by providing a system and method for the placement of an implant, especially a suture anchor, threaded, knotless or otherwise, that allows the surgeon to establish the graft position and, while maintaining that position, secure the anchor without changing the suture tension or causing a shift in the graft position and furthermore, when the anchor is threaded, without spinning of the suture. The present invention also provides off-axis socket drills and implant driving devices that enable implantation in remote and difficult to access boney surfaces using minimally invasive procedures. The present invention further provides embodiments in which the relative axial movement between the inner tensioning device and outer driver device is physically constrained, for example by means of springs and the like, so as to allow for one-handed operation. Although described in detail with respect to ligament repairs, such as repair of a torn rotator cuff, it will be readily apparent to the skilled artisan that the utility of the present invention extends to other tissues and injuries.

The disclosure of each publication, patent or patent application mentioned in this specification is specifically incorporated by reference herein in its entirety. However, nothing herein is to be construed as an admission that the invention is not entitled to antedate such disclosure by virtue of prior invention.

The invention has been illustrated by reference to specific examples and preferred embodiments. However, it should be understood that the invention is intended not to be limited by the foregoing description, but to be defined by the appended claims and their equivalents. 

What is claimed:
 1. An implant placement system for affixing a soft tissue graft to a prepared socket in a boney surface via a cannulated anchoring implant, said system comprising: a. a cannulated driver device comprising a proximal handle portion having an open proximal end, an elongate tubular distal portion that defines the longitudinal axis of the system and includes an open distal end configured to receive said implant, and at least one driver lumen extending from said open proximal end to said open distal end; b. an elongate insertion device comprising a proximal hub portion and a rigid distal portion configured to receive the first ends of one or more elongate sutures; and c. an axial control assembly having a first constrained configuration and a second free configuration; wherein: i. said insertion device is slidably received within said at least one lumen of said driver device and the proximal end of said driver device handle portion is engaged to the distal end of said insertion device hub portion; ii. when said axial control assembly is in said first constrained configuration, the distal end of said insertion device extends distally past the distal end of said implant when coupled to said driver device so as to enable said insertion device distal end to receive said suture first ends and relative axial movement between said driver device and said insertion device is precluded; and iii. when said axial control assembly is in said second free configuration, the driver device and implant move axially in a distal direction along the length of said rigid distal portion of said insertion device to thereby drive said implant into said socket while the insertion device is maintained in a fixed position.
 2. The implant placement system of claim 1, wherein said axial control assembly includes a longitudinal spring contained within said proximal hub portion.
 3. The implant placement system of claim 2, wherein said longitudinal spring is held in a compressed configuration by one or more slidable control elements.
 4. The implant placement system of claim 3, wherein said slidable control element includes extends through a lateral wall of said proximal hub portion and is transversely oriented to the longitudinal axis.
 5. The implant placement system of claim 1, wherein said implant comprises an interference plug-type anchor.
 6. The implant placement system of claim 1, wherein said implant comprises a threaded anchor.
 7. The implant placement system of claim 1, wherein said implant comprises a cannulated knotless suture anchor fabricated from a high strength ceramic material selected from the group consisting of alumina and zirconia.
 8. The implant placement system of claim 1, wherein the distal end of said driver device and a proximal end of said implant are provided with mating features that enable secure attachment of said implant to said driver device.
 9. The implant placement system of claim 8, wherein both the implant and at least the mating features of said cannulated driver device are shaped by Ceramic Injection Molding (CIM).
 10. The implant placement system of claim 1, wherein the distal end of said driver device includes torque transmitting features that, together with complementary torque receiving features formed in a proximal portion of the anchor, allow the transmission of torque to said anchor necessary to drive said anchor into said prepared socket.
 11. The implant placement system of claim 1, wherein said rigid distal portion of said insertion device has at its distal end a sharpened fork portion characterized by two or more axially extending tines spaced apart to define one or more channels therebetween in which said one or more first ends of said one or more elongate sutures may be slidably received.
 12. The implant placement system of claim 1, wherein said elongate insertion device further comprises an open proximal end, an open distal end, and at least one insertion lumen extending from open proximal end to said open distal end.
 13. The implant placement system of claim 12, wherein said system further comprises an elongate element formed from a suitably elastic metallic or polymeric material and having a first configuration characterized by first and second free proximal ends and distal end in the form of a suture capturing loop configured to receive the first ends of one or more elongate sutures; wherein: i. said insertion device is slidably received within said at least one driver lumen such that rigid distal portion extends out of the open distal end of said driver device and distally past the distal end of said suture anchor when coupled to said driver device; and ii. said elongate element in said first configuration is slidably received within said at least one insertion lumen such that the suture capturing loop extends out of and distally past the open distal end of said insertion device so as to enable said suture capturing loop to receive said suture first ends.
 14. A method for affixing a soft tissue graft to a target boney surface, the method comprising the steps of: a. providing the implant placement system of claim 1 with the proximal end of said driver device handle portion engaged to the distal end of said insertion device hub portion and the axial control assembly in said first constrained configuration, whereby relative axial movement between said driver device and said insertion device is precluded; b. positioning an anchoring implant to the distal end of said driver device; c. providing one or more elongate sutures, each of which has a first free end and a second end attached to said soft tissue graft; d. receiving said first free ends in the distal end of said insertion device; e. inserting the distal end of the insertion device into a suitably configured socket disposed in said target boney surface; f. applying tension to the suture to draw the soft tissue graft to a desired position; g. shifting said axial control assembly to said second free configuration; and h. distally advancing said driver device so as to drive the implant in the socket, whereby said implant serves to anchor said soft tissue graft to said target boney surface.
 15. The method of claim 14, further comprising step (i) of withdrawing the implant placement system after step (h).
 16. The method of claim 14, further comprising step (j) of trimming the free end of said suture after step (i).
 17. The method of claim 14, further comprising repeating steps (b) through (h) as required.
 18. The method of claim 14, wherein said anchoring implant comprises an interference plug-type anchor, further wherein the distal end of said driver device and a proximal end of said interference plug-type anchor are provided with mating features that enable secure attachment of said anchor to said driver device.
 19. The method of claim 14, wherein said anchoring implant comprises a threaded anchor, further wherein the distal end of said driver device includes torque transmitting features that, together with complementary torque receiving features formed in a proximal portion of the anchor, allow the transmission of torque to said anchor. 